Combined with the practice of permeable embankment,the paper discussed the construction methods and its materials technical requirements of permeable embankment for reference.
通过透水路堤的工程实践,探讨了透水路堤的施工方法和透水路堤材料的技术要求,并提出质量控制具体措施,达到了预期的目的。
This paper studies the second stage sampling methods used in the two stage sampling survey for waterway transportation volume.
研究了采用二阶抽样对水路运输量进行抽样调查时的第二阶抽样方法。